Finding the Fourth Proportional to 2,876.20, 3,971.69 and 1,815.87

Step by Step Solution

1. Step 1: Write the proportion equation
   2,876.20 : 3,971.69 = 1,815.87 : x
2. Step 2: Convert to fraction form
   2,876.20/3,971.69 = 1,815.87/x
3. Step 3: Cross multiply
   2,876.20x = 3,971.69 × 1,815.87
4. Step 4: Simplify right side
   2,876.20x = 7,212,072.72
5. Step 5: Solve for x
   x = 7,212,072.72/2,876.20
6. Step 6: Final answer
   x = 2,507.50